CN101128079A - Light tube driving system using electric isolation control - Google Patents
Light tube driving system using electric isolation control Download PDFInfo
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- CN101128079A CN101128079A CNA2006101114185A CN200610111418A CN101128079A CN 101128079 A CN101128079 A CN 101128079A CN A2006101114185 A CNA2006101114185 A CN A2006101114185A CN 200610111418 A CN200610111418 A CN 200610111418A CN 101128079 A CN101128079 A CN 101128079A
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- electrical isolation
- lamp
- tube driving
- driving system
- transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The utility model discloses a drive system of the lamp tube by electrical isolation and control. A front power stage and a rear power stage of the drive system are isolated by an electrical isolator. The utility model comprises that a power factor corrector exports a high voltage to a switching circuit; the switching circuit exports a driving voltage of the lamp tube to a primary side of the step-up transformer; a load and resonance network producing a feedback signal is coupled with the secondary side of the step-up transformer; the primary side of the electrical isolation, the power factor corrector, the switching circuit, and the primary side of the step-up transformer are all coupled at the primary earthing terminal; a modulating controller of the pulse width, the load and resonance network, the secondary side of the electrical isolator and the secondary side of the step-up transformer are all coupled at the secondary earthing terminal. After application of the utility model, the high voltage produced by the front power stage can not influence the actions of various controllers of the rear power stage; in addition, the manufacturing cost of the lamp tube can be reduced greatly.
Description
Technical field
The present invention relates to a kind of lamp-tube driving system that uses electrical isolation control, relate in particular to a kind of electrical isolation device that uses and make the lamp-tube driving system that control signal is isolated.
Background technology
According to the international norm of IEC1000-3-2, the above supply unit of input power 75W need have power factor correcting function (PFC), has therefore generally included a merit because of corrector in the front end power stage of supply unit.Merit is used for an AC power is carried out merit because of revising because of corrector is an existing technology, reduces the current harmonics in the power supply simultaneously, and produces the output about the about 400V of fixed voltage.
As shown in Figure 1, for having the circuit box schematic diagram of lamp-tube driving system now.Existing lamp-tube driving system 1 includes a merit and switches circuit 14, a PWM (pulse with modulation-pulse width modulation) controller 16, a step-up transformer 18, a load resonance network 19, a voltage adjuster 13 and a system controller 15 because of corrector 10, an isolated form DC/DC transducer 12.
The front end power stage of existing lamp-tube driving system 1 has comprised merit because of corrector 10 and isolated form DC/DC transducer 12, and merit has received AC power AC because of corrector 10 and produced fixing high voltage HV output.And isolated form DC/DC transducer 12 converts fixing high pressure isolation to relaying voltage VCC output, so that the needs of existing lamp-tube driving system 1 rear end power stage to be provided.The rear end power stage has comprised commutation circuit 14, PWM controller 16, step-up transformer 18 and load resonance network 19.Working voltage adjuster 13 is exported the supply voltage that AC power changes into all size in the existing lamp-tube driving system 1, and supply voltage can offer system controller 15 uses, PWM controller 16 uses or other circuit electricity consumptions.
Existing lamp-tube driving system 1 is when lighting a lamp, and the system controller 15 control signal ST that can output one lights a lamp notifies it to begin action for PWM controller 16, and PWM controller 16 produces the switching that a control signal SPWM is used for controlling commutation circuit 14.Commutation circuit 14 is switched relaying voltage VCC and is exported the high frequency alternating source to this step-up transformer 18, and step-up transformer 18 boosts into the output of high-voltage alternating power supply with the high frequency alternating source, uses so that load resonance network 19 to be provided.PWM controller 16 can be obtained a feedback signal SFB from load resonance network 19, and according to the output of this feedback signal SFB with adjustment control signal SPWM, and then kept the stable of lamp-tube driving system 1.
In the existing lamp-tube driving system 1, because the front end power stage need make hard because of corrector 10 improve merit because of, reduce current harmonics and produce fixed voltage, yet merit produces the action that fixing high voltage can influence PWM controller 16, system controller 15 or other controller of rear end because of corrector 10.So existing lamp-tube driving system 1 need use isolated form DC/DC transducer 12 to do electrical isolation and step-down, to guarantee the operate as normal of circuit in the power stage of rear end in the front end power stage.
In general, isolated form DC/DC transducer 12 has comprised elements such as transformer, controller, commutation circuit and beta-network, so isolated form DC/DC transducer 12 is compared down with other element in existing lamp-tube driving system 1, the height that its unit price is suitable, and on the component placement of overall lamp tube driving system 1, isolated form DC/DC transducer 12 occupies sizable volume ratio.
Therefore, consider the whole unit price and the component placement of lamp-tube driving system, need merit improve because of corrector merit because of lamp-tube driving system in, cast out the use of isolated form DC/DC transducer 12, the lamp-tube driving system that can have forward and backward power stage electrical isolation is again simultaneously waited the problem of doing one's utmost to research and develop for the dealer.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of lamp-tube driving system that uses electrical isolation control, this lamp-tube driving system is used as the isolation of control signal by the electrical isolation device, the high pressure that allows the front end power stage of lamp-tube driving system be produced, unlikely meeting has influence on the action of each quasi-controller of rear end power stage.
For achieving the above object, the lamp-tube driving system of use electrical isolation control provided by the invention comprises: a merit is switched circuit, a step-up transformer, a load resonance network, an electrical isolation device and a PWM controller because of corrector.Wherein, merit receives an AC power and exports a high voltage because of corrector; Commutation circuit couples this merit because of corrector, and this commutation circuit receives this high voltage and exports a fluorescent tube driving voltage; Step-up transformer has primary side and secondary side, and wherein this primary side is coupled to this commutation circuit and receives this fluorescent tube driving voltage; The load resonance network is coupled to the secondary side of this step-up transformer and produces a feedback signal; The electrical isolation utensil is side and secondary side once, and wherein this primary side is coupled to this commutation circuit, and the primary side of this electrical isolation device and this merit are coupled to earth terminal one time jointly because of the primary side of corrector, this commutation circuit and step-up transformer; And the PWM controller is coupled to this electrical isolation device and this load resonance network, this PWM controller receives this feedback signal and exports a control signal, this control signal is sent to this commutation circuit by this electrical isolation device, and the secondary side of this PWM controller and this load resonance network, electrical isolation device and the secondary side of this step-up transformer are coupled to the secondary earth terminal jointly.
Further include a voltage adjuster and a system controller in the lamp-tube driving system of the present invention, this voltage adjuster is coupled to the secondary earth terminal, receives this AC power and exports an operating voltage.And this system controller is coupled to this voltage adjuster and this PWM controller and secondary earth terminal, and this system controller receives this operating voltage, and exports one and light a lamp control signal to this PWM controller.
Adopt the present invention to be used as the isolation of control signal by the electrical isolation device, the high pressure that allows the front end power stage of lamp-tube driving system be produced, unlikely meeting has influence on the action of each quasi-controller of rear end power stage.Under the whole unit price and component placement of considering lamp-tube driving system, the present invention does not need the use of isolated form DC/DC transducer 12, and is reduced the manufacturing cost of lamp-tube driving system greatly simultaneously.
Above general introduction and ensuing detailed description are exemplary in nature all, are in order to further specify claim scope of the present invention.And about other purpose of the present invention and advantage, will be set forth in follow-up explanation and diagram.
Description of drawings
Fig. 1 is the circuit box schematic diagram of existing lamp-tube driving system;
Fig. 2 is a lamp-tube driving system circuit box schematic diagram of the present invention;
Fig. 3 is the lamp-tube driving system circuit diagram of first embodiment of the invention;
Fig. 4 is the lamp-tube driving system circuit diagram of second embodiment of the invention; And
Fig. 5 is the lamp-tube driving system circuit diagram of third embodiment of the invention.
Wherein, Reference numeral:
Existing:
1: lamp-tube driving system 10: merit is because of corrector
12: isolated form DC/DC transducer 13: voltage adjuster
14: commutation circuit 15: system controller
16:PWM controller 18: step-up transformer
19: the load resonance network
The present invention:
2: lamp-tube driving system 20: merit is because of corrector
22: electrical isolation device 23: voltage adjuster
24: commutation circuit 25: system controller
26:PWM controller 28: step-up transformer
29: load resonance network U1, U2: drive integrated circult
240: switching circuit 242: conversion line
Embodiment
With reference to figure 2, be lamp-tube driving system circuit box schematic diagram of the present invention.Lamp-tube driving system 2 of the present invention uses on the backlight driver of display, and it is luminous that lamp-tube driving system 2 drives cold cathode fluorescent lamp (CCFL), in order to provide display required backlight.Lamp-tube driving system 2 of the present invention includes a merit and switches circuit 24, a step-up transformer 28, a load resonance network 29, an electrical isolation device 22 and a PWM controller 26 because of corrector 20.
With reference to figure 2, lamp-tube driving system 2 of the present invention is distinguished into front end power stage and rear end power stage according to step-up transformer 28 and electrical isolation device 22 again.The front end power stage has comprised merit because of the primary side of corrector 20, commutation circuit 24, electrical isolation device 22 and the primary side of step-up transformer 28, and the rear end power stage has comprised secondary side, the load resonance network 29 of step-up transformer 28, the secondary side and the PWM controller 26 of electrical isolation device 22.
Again with reference to figure 2, merit has received AC power AC because of corrector 20 and has produced fixing high voltage HV output, the high voltage HV system that merit produces because of corrector 20 offers and is coupled to the commutation circuit 24 of this merit because of corrector 20, and commutation circuit 24 is exported a fluorescent tube driving voltage V1 according to this high voltage HV.Step-up transformer 28 has primary side and secondary side, and primary side is coupled to this commutation circuit 24 and receives this fluorescent tube driving voltage V1.Load resonance network 29 is coupled to the secondary side of this step-up transformer 28 and produces a feedback signal SFB.
In addition, lamp-tube driving system of the present invention further comprises a voltage adjuster 23 and a system controller 25, and this voltage adjuster 23 is coupled to secondary earth terminal g, receives this AC power AC and exports an operating voltage VDD.This system controller 25 is coupled to this voltage adjuster 23 and this PWM controller 26 and secondary earth terminal g, and this system controller 25 is reception this operating voltage VDD and exports one and light a lamp control signal ST to this PWM controller 26.
With reference to figure 2, lamp-tube driving system 2 of the present invention is when lighting a lamp again, and system controller 25 can be exported the control signal ST that lights a lamp and notify it to begin action for PWM controller 26.At this moment, PWM controller 26 action output control signal SPWM are to the secondary side of this electrical isolation device 22, this control signal SPWM of this electrical isolation device 22 of process outputs to this commutation circuit 14 from the primary side of this electrical isolation device 22, in order to control the change action of this commutation circuit 14.Simultaneously, PWM controller 26 can be obtained feedback signal SFB from load resonance network 29, and according to the output of this feedback signal SFB with adjustment control signal SPWM, and then keep the stable of lamp-tube driving system 2.
Cooperate Fig. 2,, be the lamp-tube driving system circuit diagram of first embodiment of the invention with reference to figure 3.Element in first embodiment of the invention person same as shown in Figure 2 indicates with same-sign.In first embodiment of the invention, its circuit operation principle is discussed identical with effect of reaching and earlier figures 2, only disclosed this commutation circuit 24 includes an integrated circuit U1 and a switching circuit 240 in first embodiment, and this electrical isolation device 22 with an optical coupling switch Q1 for it or an isolation drive transformer (indicate) for it.
In first embodiment, PWM controller 26 output control signal SPWM are to the secondary side of this optical coupling switch Q1, output to this integrated circuit U1 through this control signal SPWM of this optical coupling switch Q1 from the primary side of this optical coupling switch Q1, integrated circuit U1 according to this control signal SPWM in order to control the change action of this switching circuit 240.Its model of drive integrated circult U1 is the drive integrated circult of IR2104 or IR2302 and general commercially available identical function.
Cooperate Fig. 2,, be the lamp-tube driving system circuit diagram of second embodiment of the invention with reference to figure 4.Element in second embodiment of the invention person same as shown in Figure 2 indicates with same-sign.In second embodiment of the invention, its circuit operation principle is discussed identical with effect of reaching and earlier figures 2, disclosed only in a second embodiment this commutation circuit 24 includes a drive integrated circult U2 and a switching circuit 240, and this electrical isolation device 22 with two optical coupling switch Q1, Q2 for it.
In a second embodiment, PWM controller 26 output control signal SPWM1 and SPWM2 are to the secondary side of this optical coupling switch Q1, Q2, output to this driving crystal U2 through this control signal SPWM1 of this optical coupling switch Q1, Q2 and SPWM2 from the primary side of this optical coupling switch Q1, Q2, driving crystal U2 according to this control signal SPWM1 and SPWM2 in order to control the change action of this switching circuit 240.Its model of drive integrated circult U2 is the drive integrated circult of IR2301, IR2304 or IR2108 and general commercially available identical function.
Cooperate Fig. 2,, be the lamp-tube driving system circuit diagram of third embodiment of the invention with reference to figure 5.Element in third embodiment of the invention person same as shown in Figure 2 indicates with same-sign.In third embodiment of the invention, its circuit operation principle is discussed identical with effect of reaching and earlier figures 2, only disclosed this commutation circuit 24 includes a switching circuit 240 and a conversion line 242 in the 3rd embodiment, and this electrical isolation device 22 with two optical coupling switch Q1, Q2 for it.
In the 3rd embodiment, PWM controller 26 output control signal SPWM1 and SPWM2 are to the secondary side of this optical coupling switch Q1, Q2, output to this conversion line 242 through this control signal SPWM1 of this optical coupling switch Q1, Q2 and SPWM2 from the primary side of this optical coupling switch Q1, Q2, conversion line 242 according to this control signal SPWM1 and SPWM2 in order to control the change action of this switching circuit 240.Conversion line 242 is coupled by a homophase amplifier OP, a MOS switch Q3 and a SCR switch Q4 and forms.
In sum, the present invention casts out the use of isolated form DC/DC transducer 12 in the existing lamp-tube driving system 1, and merit is directly delivered to commutation circuit 24 because of corrector 20 produces fixing high voltage HV.And commutation circuit 24 is exported the primary side of fluorescent tube driving voltage V1 to step-up transformer 28 according to this high voltage HV.Simultaneously, the present invention uses electrical isolation device 22 to come that PWM controller 26 and commutation circuit 24 are made electrical safety to isolate, and the high voltage HV that is used for preventing delivering to commutation circuit 24 influences the control action of PWM controller 26.
Therefore, the present invention is used as the isolation of control signal by the electrical isolation device, the high pressure that allows the front end power stage of lamp-tube driving system be produced, and unlikely meeting has influence on the action of each quasi-controller of rear end power stage.Under the whole unit price and component placement of considering lamp-tube driving system, the present invention does not need the use of isolated form DC/DC transducer 12, and is reduced the manufacturing cost of lamp-tube driving system greatly simultaneously.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1. a lamp-tube driving system that uses electrical isolation control is characterized in that, comprising:
One merit receives an AC power and exports a high voltage because of corrector;
One switches circuit, couples this merit because of corrector, and this commutation circuit receives this high voltage and exports a fluorescent tube driving voltage;
One step-up transformer has primary side and secondary side, and the primary side of this step-up transformer is coupled to this commutation circuit and receives this fluorescent tube driving voltage;
One load resonance network is coupled to the secondary side of this step-up transformer and produces a feedback signal;
One electrical isolation device, have primary side and secondary side, the primary side of this electrical isolation device is coupled to this commutation circuit, and the primary side of this electrical isolation device and this merit are coupled to earth terminal one time jointly because of the primary side of corrector, this commutation circuit and this step-up transformer; And
One Pwm controller, be coupled to secondary side and this load resonance network of this electrical isolation device, this Pwm controller receives this feedback signal and exports a control signal, this control signal is sent to this commutation circuit by this electrical isolation device, and the secondary side of this Pwm controller and this load resonance network, this electrical isolation device and the secondary side of this step-up transformer are coupled to the secondary earth terminal jointly.
2. the lamp-tube driving system of use electrical isolation control according to claim 1 is characterized in that further include a voltage adjuster, this voltage adjuster is coupled to the secondary earth terminal, receives this AC power and exports an operating voltage.
3. the lamp-tube driving system of use electrical isolation control according to claim 2, it is characterized in that, further include a system controller, this system controller is coupled to this voltage adjuster and this Pwm controller and secondary earth terminal, and this system controller receives this operating voltage and exports one and light a lamp control signal to this Pwm controller.
4. the lamp-tube driving system of use electrical isolation control according to claim 1 is characterized in that this commutation circuit is a full-bridge type commutation circuit, a semibridge system commutation circuit or a push-pull type commutation circuit.
5. the lamp-tube driving system of use electrical isolation control according to claim 4 is characterized in that this commutation circuit includes a drive integrated circult and a switching circuit.
6. the lamp-tube driving system of use electrical isolation control according to claim 5 is characterized in that this electrical isolation device is an optical coupling switch.
7. the lamp-tube driving system of use electrical isolation control according to claim 4 is characterized in that this commutation circuit includes a switching circuit and a conversion line.
8. the lamp-tube driving system of use electrical isolation control according to claim 7 is characterized in that this electrical isolation device is an optical coupling switch.
9. the lamp-tube driving system of use electrical isolation control according to claim 5 is characterized in that this electrical isolation device can be an isolation drive transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101114185A CN101128079B (en) | 2006-08-16 | 2006-08-16 | Light tube driving system using electric isolation control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101114185A CN101128079B (en) | 2006-08-16 | 2006-08-16 | Light tube driving system using electric isolation control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101128079A true CN101128079A (en) | 2008-02-20 |
| CN101128079B CN101128079B (en) | 2010-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101114185A Expired - Fee Related CN101128079B (en) | 2006-08-16 | 2006-08-16 | Light tube driving system using electric isolation control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101128079B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026720A (en) * | 2016-06-27 | 2016-10-12 | 广东美的制冷设备有限公司 | PFC sampling circuit and air conditioner |
| CN107947108A (en) * | 2017-12-27 | 2018-04-20 | 四川赛科安全技术有限公司 | Over-current detection applied to fire alarm control system protects circuit and implementation method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2364654Y (en) * | 1999-01-18 | 2000-02-16 | 李名酉 | Electronic ballast for high intensity gas discharge lamp |
| DE10329876B4 (en) * | 2003-07-02 | 2016-06-02 | Tridonic Gmbh & Co Kg | Interface for a lamp operating device with low standby losses and method for driving a lamp operating device via such an interface |
| CN2779793Y (en) * | 2005-03-31 | 2006-05-10 | 北京中科信电子装备有限公司 | Ion-source filament supply |
-
2006
- 2006-08-16 CN CN2006101114185A patent/CN101128079B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026720A (en) * | 2016-06-27 | 2016-10-12 | 广东美的制冷设备有限公司 | PFC sampling circuit and air conditioner |
| CN107947108A (en) * | 2017-12-27 | 2018-04-20 | 四川赛科安全技术有限公司 | Over-current detection applied to fire alarm control system protects circuit and implementation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101128079B (en) | 2010-12-15 |
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| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20101215 Termination date: 20120816 |